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The integral ∫ π + + 0 2 dx x cos 3 1 x sin ) 3 x ( is equal to

1. ) 6 ( 3 3 + π π
2. ) 4 ( 3 2 + π π
3. ) 1 ( 3 + π π
4. ) 2 ( 3 + π π

Correct answer: ) 6 ( 3 3 + π π

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